HUD Mirror Holder Layout for Off-Center Vibration Resistance
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Solution Overview
Problem
In mirror units for head-up display devices, the natural frequency is decreased when a part to be pressed is arranged off-center, leading to potential vibration resistance issues.
Innovation Solution
A mirror unit design with a holder that includes a first support part fixed by a first double-sided tape and a second support part, larger in shape and closer to the opposite end of the reflecting mirror, both fixed by double-sided tapes, maintains vibration resistance by optimizing the distribution of support and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the part to be pressed is arranged off-center to satisfy layout constraints, then the ease of operation is improved, but the natural frequency decreases and vibration resistance deteriorates
Solution Approach 1:
The holder is designed with non-uniform support parts: a first support part at the pressed end and a second support part larger in area at the opposite end. This local variation in support structure compensates for the off-center pressing force, distributing mechanical stress to maintain natural frequency and vibration resistance despite the asymmetric layout configuration.
Solution Approach 2:
The holder intentionally employs asymmetric support part distribution rather than symmetric design. The second support part is deliberately made larger than the first support part to counterbalance the off-center pressing point, creating an asymmetric structure that optimizes both operational flexibility and vibration resistance.
2Manufacturing precision
If the holder has a bilaterally symmetrical shape, then the manufacturing precision is improved, but the natural frequency decreases when the part to be pressed is off-center
Solution Approach 1:
Instead of maintaining overall symmetric holder design, the invention applies local quality variation by making the second support part larger than the first support part. This localized asymmetry in the support structure compensates for the off-center pressing force while maintaining ease of manufacture through standardized components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively maintains vibration resistance by preventing a decrease in natural frequency at the end of the reflecting mirror farthest from the part to be pressed, ensuring stable operation.
Implementation Method 1
the first support part is fixed to the back surface by a first double-sided tape; the second support part is fixed to the back surface by a second double-sided tape
Data Source
AI summary
Provided is a mirror unit capable of maintaining good vibration proof. A mirror unit comprises a reflecting mirror, and a holder that holds the reflecting mirror from a back surface thereof. The mirror unit rotates about an axis by the holder being pressed by a linearly moving slider, and is provided in a head-up display device. The holder comprises a part to be pressed, a first support part, and a second support part. The part to be pressed is located at a position that deviates from a center of the reflecting mirror toward a first end of the reflecting mirror, and is pressed by the slider. The first support part is located at a position corresponding to the part to be pressed, and is affixed to the back surface. The second support part is located closer to a second end of the reflecting mirror than the first support part, has a larger outer shape than the first support part, and is affixed to the back surface.